RaspiROBOhttp://dozinapp.com/raspirobo.html
Building a Raspberry Pi Controlled Car, Android app control / Keypad
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This robot is one of the simplest robots you can build and uses two DC motors to control a pair of wheels. There are no sensors or other inputs to the robot, it will just follow a set of instructions in Python code that tell the robot how to move.You could add a usb camera to get a photo or add sensors to detect objects around the Pi.